Test gauge



1, May s, 1927. J' W CARTHEW 626 599 TEST GAUGE Filed Aug. 13. 1925 ATTORNE Patented May 3, 1927.

yJOHN W. CARTHEW, or WILMERDING, PENNSYLVANIA, issrGNoR To `THR WEST'VYING- HOUSE AIR BRAKE ooMrANroF WILMRRDING, ,1,ENixIazr-N'ANIA,y A CORPORATION 0F PENNSYLVANIA.

.TEST GAUGE. l

Application filed August'l, y1925. Serial No. 50,0015r This invention relates to gauges and has 'for its principalv object to provide an improved gauge device tor measuring the inside diameter of any cylindrical bore.

` In the accompanying drawing; Fig. 1 is a vertical sect-ion ot my 'improved ygauge ydevice as applied to a bushed cylinder; Fig. 2 a plan view of-the gauge; Fig. 3y a detail view of the sleeve member employed in the gauge.; and Fig. 4 a Section on line H ot F ig. 2. f v v 1 For the purpose ot illustratiom-I have shown my vgauge as applied to the piston cylinder of an ordinary triple valve device, but

as before stated, the gauge may beused in' measuring' the inside diameter of any cylindrical bore.

Referring to the drawing, reference numeral 1 indicates a triple valve casting having a piston cylinder bush 2 andmounted in said bush is a gauge device which may comprise a sleeve member 3, internally threaded to receive an externally threaded hollon7 plug 4 havingia; tapered portion 5. Associated with sleeve member 3 is an adjusting plate 6 adapted to engage casting 1 and provided with a plurality of radial bores for re ceiving pins 7, which are held in place by cotter pins 8. lThe pins 7 are adapted to engage a spiral groove 9 vcut in the outer wall of sleeve member 3, said pins acting as guides, so that the sleeve member .3 may be screwed in. or out of the bushing 2. A spring pressed pin 10 carried by plate 6 is adapted to engage a bore inv the casting 1, so as to hold the adjusting plate 6 in position against rotation with respect to the casting 1.

A spring pressed ball 11 is provided in adjusting 4plate 6 and is adapted in different positions of the Sleeve member 3 to engage one of a plurality'of recesses 12, provided in the outer wall of said sleeve member, for delining the different positions thereof, and a screw 13 having a stem 14 adapted to engage ball 11 isprovided for the purpose of holding the ball in looking engagement with a particular recess when desired.

Mounted in radially extending bores provided in sleeve members 3 are gauge pinsl 15, said pins being adapted to engage at one end the tapered portion 5 of plug 4 and said pins are yiel'dingly held in engagement therewith` by a. split spring ring 16 disposed in aring groove 17 insleeve member 3.

On the radial wall connecting the upward-V4 ly extending handle portion v18ct plug 4 with the threaded portion are radial serrations 19, which are adapted to mesh with Serrat-ions 2O on. the underv tace of dial plate 21,v said plate being provided'with a central bore so that it can be slipped overzliandle portion 18 and ot such diameter vvas to loosely 'in sleeve member 3. A nut? 22 having screw-threaded engagement withl handle Vportion 1.8 is kprovided to clamp the'. dial plate 21 1n engagement with the serrations.'

on plug 4. The top. face of dial plate 21` is marked olt'in gra'duations, andpre'terably the number of graduations are madeequal to the number ot serrations 19. In orderlto simplify the` reading of the gauge, it is preferable to so adjust the gauge.'H that the dial plate will read Zero'w-hen the gauge pins are set for a predetermined di` ameter to be measured.- In. ordertoyso set the gauge device, the. sleeve member 3i is inserted into a cylinder or ring ground accurately to the predetermined diameter.

Theplug 4 is then screwed into sleeve member3 until the tapered portion 5 of plug 4 has forced the gauge pins 15 into engagement with the Awalls of the cylinder.

The nut 22V is then loosened so thatt-he dial plate 21` can be disengaged from the serrations 19 on plug 4 andthe dial plateisthen rotated until the graduation representv ing zero on the dial plate registers with zero mark 26 on the edge of sleeve member 3.`

The number of serrations being equal to the number of Agraduat-ions, the dial plate may now be placed in engagement with the serrations on plug 4 and nut 22 tightened, soas l y to locky said plate in its `adjusted position.

When it is desired'to measure theinside diameter of acylinder, the adjusting plate 6 of the gauge device ismounted on the end of the cylinder, with the spring pressed pin 10 engaging a bore in the cylinder casting so yas to hold said plate against rotation. The sleeve member'3 is then screwed into the cylinder-until gauge pins 15 are opposite the place in the cylinder where it is de` sired to measure the diameter. The spring pressed ball l1 will then engage a recess 12 oversizemay then be, read, in decimal parts of an inc-h, by the number of graduations the zeromark on the dial plate is away from the zerofpoint 26 on sleeve member 3.

i If the cylinder isundersize, the plug l is rotated in the opposite direction, thereby withdrawing tapered portion v `from between gauge pins'l, enabling the spring ring 16 to force said pins inwardly until the sleeve member 3 caribe inserted into the cylinder, the amount that the cylinder is undersize being read iii .thesaine manner as when the cylinder is oversize.

If it is desired to measure the diameter o't' `the cylinder atvniore than. one place, the lscrew 13k is loosened, thereby releasing ball .11v from looking engagement.' with the pare ticular recess f12 'and enabling the sleeve Vmember 3 tol be vrotated either in or out 'of the cylinder until the other desired position is vindicated by the snapping 'ot spring lpressed ball 1l into another recess 12. The -screw 13 is then tightened, locking the sleeve in this position, and the diameter is measuied in the same manner as hereinbeioie described. r

- The taper on portion 5 of plug 4 and the pitch of the enternal threads on plug et are so related that each graduation on the dial plate 21 represents a decimal part of an inch increase lin the diameter spanned by the gauge pins, such, tor example, as each graduation indicating .001 yof an inch radial movement of the gauge pins.l

Having now described my invention, what I claim as new andJdesire to secure by Letters Patent`v is z- A' Y Y 1. A cylinder gauge comprising a sleeve having a screw thread, radially movable pins mounted in said sleeve, a plug having screwthreaded engagement in said sleeve and having a tapered portion engaging said pins,

and a collar within which said sleeveis Vmounted and having means for engaging the screwethread on said sleeve to permit'axia adjustment of said sleeve. v

2. A cylinder gauge comprising a sleeve adapted to be inserted in the cylinder bore and having radially movable pins mounted therein, means -tor radially vmoving said pins to engage the cylinder bore, and means foradpisting the sleeve tov differentl depths inthe cylinder bore. 3. A cylinder gauge comprising a sleeve adapted to be inserted in thev cylinder bore and having radially movable pins mounted therein, means for radially moving said pins v to engage the cylinder bore, and means for adjustingv and lockingy said sleeve at diler# ent axial positions of said cylinder bore, to permit testing the cylinder bore at dilerent depths;

'ln testimony whereof I have hereunto set' my hand. z f OHN W. -CARTHEV 

